Method of producing boehmite nanoparticles and apparatus for producing the same
Provided are a method for producing boehmite nanoparticles and an apparatus for producing the same, and more particularly, a method for producing boehmite nanoparticles and an apparatus for producing the same, which allow continuous production of nano-sized boehmite nanoparticles in a uniform size. The method for producing boehmite nanoparticles includes (S1) supplying a mixture including an aluminum hydroxide and an organic acid to a reaction unit; and (S2) heating and pressurizing the mixture supplied to the reaction unit simultaneously and sequentially.
1 . A method for producing boehmite, the method comprising:
(S0) reacting a raw material comprising an aluminum alkoxide and an organic acid to produce a mixture comprising an aluminum hydroxide and an organic acid;
(S1) supplying the mixture comprising the aluminum hydroxide and the organic acid to a reaction unit; and
(S2) heating and pressurizing the mixture supplied to the reaction unit simultaneously or sequentially,
wherein the organic acid comprised in the raw material of (S0) is the same as the organic acid comprised in the mixture of (S1), and
wherein the method produces rod-shaped boehmite nanoparticles having an average-short axis diameter of 1 to 10 nm and an average long axis length of 30 to 100 nm.
2 . The method for producing boehmite of claim 1 , wherein (S2) comprises:
(S2-1) heating the mixture supplied to the reaction unit; and
(S2-2) pressurizing the heated mixture.
3 . The method for producing boehmite of claim 1 , wherein in (S2), a temperature to which the mixture is heated is 80 to 200° C.
4 . The method for producing boehmite of claim 1 , wherein in (S2), a pressure to which the mixture is pressurized is 5 to 15 bar.
5 . The method for producing boehmite of claim 1 , wherein a liquid hour space velocity (LHSV) of the mixture is 0.01 to 5 h −1 .
6 . The method for producing boehmite of claim 1 , wherein in (S1), the organic acid is a (C2-C20) organic acid.
7 . The method for producing boehmite of claim 1 , wherein in (S0), water is added to the raw material to react the raw material, and (S0) comprises (S0-1) removing a reaction by-product comprising alcohol during the reaction of the raw material.
8 . The method for producing boehmite of claim 7 , wherein in (S0), the removing of the reaction by-product is performed by distillation.
9 . The method for producing boehmite of claim 1 , wherein in (S0), the aluminum alkoxide is represented by the following Chemical Formula 1:
Al(O—R) 3 [Chemical Formula 1]
wherein R is (C1-C20) alkyl, (C2-C20) alkenyl, (C3-C20) cycloalkyl, (C6-C20) aryl, (C1-C20) alkylsilyl, (C7-C20) arylalkyl, or (C7-C20) alkylaryl.
10 . The method for producing boehmite of claim 9 , wherein in (S0), the aluminum alkoxide is aluminum iso-propoxide.
11 . The method for producing boehmite of claim 1 , wherein in (S0), the raw material has a mole ratio of the aluminum alkoxide: the organic acid of 1:0.001 to 1.
12 . The method for producing boehmite of claim 1 , wherein in (S1), the aluminum hydroxide is gelled.
13 . The method for producing boehmite of claim 1 , wherein the rod-shaped boehmite nanoparticles satisfy the following Relations 1 to 4:
50 nm≤D 50 ≤70 nm [Relation 1]
0.70≤D 20 /D 50 ≤0.98 [Relation 2]
1.02≤D 70 /D 50 ≤1.3 [Relation 3]
D 95 ≤100 nm
wherein D 50 in Relation 1 is a long axis length corresponding to 50% in a long axis length cumulative distribution of the rod-shaped boehmite nanoparticles, D 20 and D 50 in Relation 2 are long axis lengths corresponding to 20% and 50%, respectively, in the long axis length cumulative distribution of the rod-shaped boehmite nanoparticles, Dro and D 50 in Relation 3 are long axis lengths corresponding to 70% and 50%, respectively, in the long axis length cumulative distribution of the boehmite nanoparticles, and D 95 is a long axis length corresponding to 95% in the long axis length cumulative distribution of the boehmite nanoparticles.
14 . The method for producing boehmite of claim 1 , wherein the rod-shaped boehmite nanoparticles have an aspect ratio of 5:1 to 20:1.